You're absolutely right that there are many instances across w.org that fail to meet this particular guideline. So many in fact that it's difficult to deal with them all, and some are in parts of the codebase that are in dire need of an overhaul. I'm going to close this ticket as maybelater, in the sense that we'll fix them either as updates are made to those themes, or when we have a more complete patch that covers most of the codebase. That's not a reflection on your effort, just the nature of an ageing codebase and limited resources.